What to Consider When Upgrading My PC to a 9800X3D?

When you build your PC, consider updating the BIOS for the latest improvements and use the built-in update option. XMP/EXPO is your friend for RAM settings — make sure that’s enabled.
For stress testing, I find benchmarks can sometimes create unnecessary pressure, so I usually stop at regular usage tests. Additionally, managing your fan curves correctly can help.
Keep in mind that the 9800X3D has safety limits to avoid overheating, so as long as you're below those thresholds, you're doing fine!

Definitely enable XMP or EXPO (if you're using AMD), that's super important for RAM stability. For stress testing, use Cinebench for your CPU and something like FurMark for your GPU to check their limits.

If you’re keeping the same SSD/HDD, a full reset of Windows is usually best. I personally wipe the drive completely, but you can try to reset and keep files. Change the BIOS setting to XMP, and leave Windows as is for now.
For stress testing, I stick with FurMark for the GPU and Cinebench for CPU. As for undervolting, it’s probably overkill for most users unless you want to dive deep into tweaking.

You might want to check out some videos for guides; channels like LTT have good ones. To answer your questions:
- For BIOS, definitely enable XMP/EXPO, and maybe tweak fan curves or power settings.
- In Windows, I suggest looking at settings like mouse acceleration and power modes to fit your style.
- Stress test with Cinebench and 3DMark - they’re pretty reliable.
- As for undervolting, I don’t think it’s necessary for your CPU unless it starts pulling a lot of power. Just monitor it for stability first.